1 /*****************************************************************************
2 * threads.c : threads implementation for the VideoLAN client
3 *****************************************************************************
4 * Copyright (C) 1999-2008 the VideoLAN team
7 * Authors: Jean-Marc Dressler <polux@via.ecp.fr>
8 * Samuel Hocevar <sam@zoy.org>
9 * Gildas Bazin <gbazin@netcourrier.com>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
26 *****************************************************************************/
32 #include <vlc_common.h>
42 #if defined( LIBVLC_USE_PTHREAD )
45 static vlc_threadvar_t cancel_key;
48 #ifdef HAVE_EXECINFO_H
49 # include <execinfo.h>
53 # define WaitForSingleObjectEx(a,b,c) WaitForSingleObject(a,b)
57 * Print a backtrace to the standard error for debugging purpose.
59 void vlc_trace (const char *fn, const char *file, unsigned line)
61 fprintf (stderr, "at %s:%u in %s\n", file, line, fn);
62 fflush (stderr); /* needed before switch to low-level I/O */
65 int len = backtrace (stack, sizeof (stack) / sizeof (stack[0]));
66 backtrace_symbols_fd (stack, len, 2);
73 static inline unsigned long vlc_threadid (void)
75 #if defined(LIBVLC_USE_PTHREAD)
76 union { pthread_t th; unsigned long int i; } v = { };
77 v.th = pthread_self ();
81 return GetCurrentThreadId ();
89 /*****************************************************************************
90 * vlc_thread_fatal: Report an error from the threading layer
91 *****************************************************************************
92 * This is mostly meant for debugging.
93 *****************************************************************************/
95 vlc_thread_fatal (const char *action, int error,
96 const char *function, const char *file, unsigned line)
98 fprintf (stderr, "LibVLC fatal error %s (%d) in thread %lu ",
99 action, error, vlc_threadid ());
100 vlc_trace (function, file, line);
102 /* Sometimes strerror_r() crashes too, so make sure we print an error
103 * message before we invoke it */
105 /* Avoid the strerror_r() prototype brain damage in glibc */
107 fprintf (stderr, " Error message: %m\n");
108 #elif !defined (WIN32)
112 switch (strerror_r (error, buf, sizeof (buf)))
117 case ERANGE: /* should never happen */
118 msg = "unknwon (too big to display)";
121 msg = "unknown (invalid error number)";
124 fprintf (stderr, " Error message: %s\n", msg);
132 # define VLC_THREAD_ASSERT( action ) \
133 if (val) vlc_thread_fatal (action, val, __func__, __FILE__, __LINE__)
135 # define VLC_THREAD_ASSERT( action ) ((void)val)
139 * Per-thread cancellation data
141 #ifndef LIBVLC_USE_PTHREAD_CANCEL
142 typedef struct vlc_cancel_t
144 vlc_cleanup_t *cleaners;
149 # define VLC_CANCEL_INIT { NULL, true, false }
153 static vlc_mutex_t super_mutex;
155 BOOL WINAPI DllMain (HINSTANCE hinstDll, DWORD fdwReason, LPVOID lpvReserved)
162 case DLL_PROCESS_ATTACH:
163 vlc_mutex_init (&super_mutex);
164 vlc_threadvar_create (&cancel_key, free);
167 case DLL_PROCESS_DETACH:
168 vlc_threadvar_delete( &cancel_key );
169 vlc_mutex_destroy (&super_mutex);
176 #if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
177 /* This is not prototyped under glibc, though it exists. */
178 int pthread_mutexattr_setkind_np( pthread_mutexattr_t *attr, int kind );
181 /*****************************************************************************
182 * vlc_mutex_init: initialize a mutex
183 *****************************************************************************/
184 int vlc_mutex_init( vlc_mutex_t *p_mutex )
186 #if defined( LIBVLC_USE_PTHREAD )
187 pthread_mutexattr_t attr;
190 pthread_mutexattr_init( &attr );
193 /* Create error-checking mutex to detect problems more easily. */
194 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
195 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_ERRORCHECK_NP );
197 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_ERRORCHECK );
200 i_result = pthread_mutex_init( p_mutex, &attr );
201 pthread_mutexattr_destroy( &attr );
204 #elif defined( WIN32 )
205 /* This creates a recursive mutex. This is OK as fast mutexes have
206 * no defined behavior in case of recursive locking. */
207 InitializeCriticalSection (&p_mutex->mutex);
208 p_mutex->initialized = 1;
214 /*****************************************************************************
215 * vlc_mutex_init: initialize a recursive mutex (Do not use)
216 *****************************************************************************/
217 int vlc_mutex_init_recursive( vlc_mutex_t *p_mutex )
219 #if defined( LIBVLC_USE_PTHREAD )
220 pthread_mutexattr_t attr;
223 pthread_mutexattr_init( &attr );
224 # if defined (__GLIBC__) && (__GLIBC_MINOR__ < 6)
225 pthread_mutexattr_setkind_np( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
227 pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
229 i_result = pthread_mutex_init( p_mutex, &attr );
230 pthread_mutexattr_destroy( &attr );
233 #elif defined( WIN32 )
234 InitializeCriticalSection( &p_mutex->mutex );
235 p_mutex->initialized = 1;
243 * Destroys a mutex. The mutex must not be locked.
245 * @param p_mutex mutex to destroy
246 * @return always succeeds
248 void vlc_mutex_destroy (vlc_mutex_t *p_mutex)
250 #if defined( LIBVLC_USE_PTHREAD )
251 int val = pthread_mutex_destroy( p_mutex );
252 VLC_THREAD_ASSERT ("destroying mutex");
254 #elif defined( WIN32 )
255 assert (p_mutex->initialized);
256 DeleteCriticalSection (&p_mutex->mutex);
262 * Acquires a mutex. If needed, waits for any other thread to release it.
263 * Beware of deadlocks when locking multiple mutexes at the same time,
264 * or when using mutexes from callbacks.
266 * @param p_mutex mutex initialized with vlc_mutex_init() or
267 * vlc_mutex_init_recursive()
269 void vlc_mutex_lock (vlc_mutex_t *p_mutex)
271 #if defined(LIBVLC_USE_PTHREAD)
272 int val = pthread_mutex_lock( p_mutex );
273 VLC_THREAD_ASSERT ("locking mutex");
275 #elif defined( WIN32 )
276 if (InterlockedCompareExchange (&p_mutex->initialized, 0, 0) == 0)
277 { /* ^^ We could also lock super_mutex all the time... sluggish */
278 assert (p_mutex != &super_mutex); /* this one cannot be static */
280 vlc_mutex_lock (&super_mutex);
281 vlc_mutex_init (p_mutex);
282 /* FIXME: destroy the mutex some time... */
283 vlc_mutex_unlock (&super_mutex);
285 EnterCriticalSection (&p_mutex->mutex);
292 * Releases a mutex (or crashes if the mutex is not locked by the caller).
293 * @param p_mutex mutex locked with vlc_mutex_lock().
295 void vlc_mutex_unlock (vlc_mutex_t *p_mutex)
297 #if defined(LIBVLC_USE_PTHREAD)
298 int val = pthread_mutex_unlock( p_mutex );
299 VLC_THREAD_ASSERT ("unlocking mutex");
301 #elif defined( WIN32 )
302 LeaveCriticalSection (&p_mutex->mutex);
307 /*****************************************************************************
308 * vlc_cond_init: initialize a condition variable
309 *****************************************************************************/
310 int vlc_cond_init( vlc_cond_t *p_condvar )
312 #if defined( LIBVLC_USE_PTHREAD )
313 pthread_condattr_t attr;
316 ret = pthread_condattr_init (&attr);
320 # if !defined (_POSIX_CLOCK_SELECTION)
321 /* Fairly outdated POSIX support (that was defined in 2001) */
322 # define _POSIX_CLOCK_SELECTION (-1)
324 # if (_POSIX_CLOCK_SELECTION >= 0)
325 /* NOTE: This must be the same clock as the one in mtime.c */
326 pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);
329 ret = pthread_cond_init (p_condvar, &attr);
330 pthread_condattr_destroy (&attr);
333 #elif defined( WIN32 )
334 /* Create a manual-reset event (manual reset is needed for broadcast). */
335 *p_condvar = CreateEvent( NULL, TRUE, FALSE, NULL );
336 return *p_condvar ? 0 : ENOMEM;
342 * Destroys a condition variable. No threads shall be waiting or signaling the
344 * @param p_condvar condition variable to destroy
346 void vlc_cond_destroy (vlc_cond_t *p_condvar)
348 #if defined( LIBVLC_USE_PTHREAD )
349 int val = pthread_cond_destroy( p_condvar );
350 VLC_THREAD_ASSERT ("destroying condition");
352 #elif defined( WIN32 )
353 CloseHandle( *p_condvar );
359 * Wakes up one thread waiting on a condition variable, if any.
360 * @param p_condvar condition variable
362 void vlc_cond_signal (vlc_cond_t *p_condvar)
364 #if defined(LIBVLC_USE_PTHREAD)
365 int val = pthread_cond_signal( p_condvar );
366 VLC_THREAD_ASSERT ("signaling condition variable");
368 #elif defined( WIN32 )
369 /* NOTE: This will cause a broadcast, that is wrong.
370 * This will also wake up the next waiting thread if no thread are yet
371 * waiting, which is also wrong. However both of these issues are allowed
372 * by the provision for spurious wakeups. Better have too many wakeups
373 * than too few (= deadlocks). */
374 SetEvent (*p_condvar);
380 * Wakes up all threads (if any) waiting on a condition variable.
381 * @param p_cond condition variable
383 void vlc_cond_broadcast (vlc_cond_t *p_condvar)
385 #if defined (LIBVLC_USE_PTHREAD)
386 pthread_cond_broadcast (p_condvar);
388 #elif defined (WIN32)
389 SetEvent (*p_condvar);
395 # define WaitForMultipleObjectsEx(a,b,c) WaitForMultipleObjects(a,b)
399 * Waits for a condition variable. The calling thread will be suspended until
400 * another thread calls vlc_cond_signal() or vlc_cond_broadcast() on the same
401 * condition variable, the thread is cancelled with vlc_cancel(), or the
402 * system causes a "spurious" unsolicited wake-up.
404 * A mutex is needed to wait on a condition variable. It must <b>not</b> be
405 * a recursive mutex. Although it is possible to use the same mutex for
406 * multiple condition, it is not valid to use different mutexes for the same
407 * condition variable at the same time from different threads.
409 * In case of thread cancellation, the mutex is always locked before
410 * cancellation proceeds.
412 * The canonical way to use a condition variable to wait for event foobar is:
414 vlc_mutex_lock (&lock);
415 mutex_cleanup_push (&lock); // release the mutex in case of cancellation
418 vlc_cond_wait (&wait, &lock);
420 --- foobar is now true, do something about it here --
422 vlc_cleanup_run (); // release the mutex
425 * @param p_condvar condition variable to wait on
426 * @param p_mutex mutex which is unlocked while waiting,
427 * then locked again when waking up.
428 * @param deadline <b>absolute</b> timeout
430 * @return 0 if the condition was signaled, an error code in case of timeout.
432 void vlc_cond_wait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex)
434 #if defined(LIBVLC_USE_PTHREAD)
435 int val = pthread_cond_wait( p_condvar, p_mutex );
436 VLC_THREAD_ASSERT ("waiting on condition");
438 #elif defined( WIN32 )
444 LeaveCriticalSection (&p_mutex->mutex);
445 result = WaitForSingleObjectEx (*p_condvar, INFINITE, TRUE);
446 EnterCriticalSection (&p_mutex->mutex);
448 while (result == WAIT_IO_COMPLETION);
450 ResetEvent (*p_condvar);
456 * Waits for a condition variable up to a certain date.
457 * This works like vlc_cond_wait(), except for the additional timeout.
459 * @param p_condvar condition variable to wait on
460 * @param p_mutex mutex which is unlocked while waiting,
461 * then locked again when waking up.
462 * @param deadline <b>absolute</b> timeout
464 * @return 0 if the condition was signaled, an error code in case of timeout.
466 int vlc_cond_timedwait (vlc_cond_t *p_condvar, vlc_mutex_t *p_mutex,
469 #if defined(LIBVLC_USE_PTHREAD)
470 lldiv_t d = lldiv( deadline, CLOCK_FREQ );
471 struct timespec ts = { d.quot, d.rem * (1000000000 / CLOCK_FREQ) };
473 int val = pthread_cond_timedwait (p_condvar, p_mutex, &ts);
474 if (val != ETIMEDOUT)
475 VLC_THREAD_ASSERT ("timed-waiting on condition");
478 #elif defined( WIN32 )
485 mtime_t total = (deadline - mdate ())/1000;
489 DWORD delay = (total > 0x7fffffff) ? 0x7fffffff : total;
490 LeaveCriticalSection (&p_mutex->mutex);
491 result = WaitForSingleObjectEx (*p_condvar, delay, TRUE);
492 EnterCriticalSection (&p_mutex->mutex);
494 while (result == WAIT_IO_COMPLETION);
496 ResetEvent (*p_condvar);
498 return (result == WAIT_OBJECT_0) ? 0 : ETIMEDOUT;
503 /*****************************************************************************
504 * vlc_tls_create: create a thread-local variable
505 *****************************************************************************/
506 int vlc_threadvar_create( vlc_threadvar_t *p_tls, void (*destr) (void *) )
510 #if defined( LIBVLC_USE_PTHREAD )
511 i_ret = pthread_key_create( p_tls, destr );
512 #elif defined( WIN32 )
513 /* FIXME: remember/use the destr() callback and stop leaking whatever */
515 i_ret = (*p_tls == TLS_OUT_OF_INDEXES) ? EAGAIN : 0;
517 # error Unimplemented!
522 void vlc_threadvar_delete (vlc_threadvar_t *p_tls)
524 #if defined( LIBVLC_USE_PTHREAD )
525 pthread_key_delete (*p_tls);
526 #elif defined( WIN32 )
529 # error Unimplemented!
533 #if defined (LIBVLC_USE_PTHREAD)
534 #elif defined (WIN32)
535 static unsigned __stdcall vlc_entry (void *data)
537 vlc_cancel_t cancel_data = VLC_CANCEL_INIT;
538 vlc_thread_t self = data;
540 vlc_threadvar_set (&cancel_key, &cancel_data);
541 self->data = self->entry (self->data);
547 * Creates and starts new thread.
549 * @param p_handle [OUT] pointer to write the handle of the created thread to
550 * @param entry entry point for the thread
551 * @param data data parameter given to the entry point
552 * @param priority thread priority value
553 * @return 0 on success, a standard error code on error.
555 int vlc_clone (vlc_thread_t *p_handle, void * (*entry) (void *), void *data,
560 #if defined( LIBVLC_USE_PTHREAD )
562 pthread_attr_init (&attr);
564 /* Block the signals that signals interface plugin handles.
565 * If the LibVLC caller wants to handle some signals by itself, it should
566 * block these before whenever invoking LibVLC. And it must obviously not
567 * start the VLC signals interface plugin.
569 * LibVLC will normally ignore any interruption caused by an asynchronous
570 * signal during a system call. But there may well be some buggy cases
571 * where it fails to handle EINTR (bug reports welcome). Some underlying
572 * libraries might also not handle EINTR properly.
578 sigdelset (&set, SIGHUP);
579 sigaddset (&set, SIGINT);
580 sigaddset (&set, SIGQUIT);
581 sigaddset (&set, SIGTERM);
583 sigaddset (&set, SIGPIPE); /* We don't want this one, really! */
584 pthread_sigmask (SIG_BLOCK, &set, &oldset);
587 struct sched_param sp = { .sched_priority = priority, };
590 if (sp.sched_priority <= 0)
591 sp.sched_priority += sched_get_priority_max (policy = SCHED_OTHER);
593 sp.sched_priority += sched_get_priority_min (policy = SCHED_RR);
595 pthread_attr_setschedpolicy (&attr, policy);
596 pthread_attr_setschedparam (&attr, &sp);
599 /* The thread stack size.
600 * The lower the value, the less address space per thread, the highest
601 * maximum simultaneous threads per process. Too low values will cause
602 * stack overflows and weird crashes. Set with caution. Also keep in mind
603 * that 64-bits platforms consume more stack than 32-bits one.
605 * Thanks to on-demand paging, thread stack size only affects address space
606 * consumption. In terms of memory, threads only use what they need
607 * (rounded up to the page boundary).
609 * For example, on Linux i386, the default is 2 mega-bytes, which supports
610 * about 320 threads per processes. */
611 #define VLC_STACKSIZE (128 * sizeof (void *) * 1024)
614 ret = pthread_attr_setstacksize (&attr, VLC_STACKSIZE);
615 assert (ret == 0); /* fails iif VLC_STACKSIZE is invalid */
618 ret = pthread_create (p_handle, &attr, entry, data);
619 pthread_sigmask (SIG_SETMASK, &oldset, NULL);
620 pthread_attr_destroy (&attr);
622 #elif defined( WIN32 ) || defined( UNDER_CE )
623 /* When using the MSVCRT C library you have to use the _beginthreadex
624 * function instead of CreateThread, otherwise you'll end up with
625 * memory leaks and the signal functions not working (see Microsoft
626 * Knowledge Base, article 104641) */
628 vlc_thread_t th = malloc (sizeof (*th));
635 #if defined( UNDER_CE )
636 hThread = CreateThread (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
638 hThread = (HANDLE)(uintptr_t)
639 _beginthreadex (NULL, 0, vlc_entry, th, CREATE_SUSPENDED, NULL);
645 /* Thread closes the handle when exiting, duplicate it here
646 * to be on the safe side when joining. */
647 if (!DuplicateHandle (GetCurrentProcess (), hThread,
648 GetCurrentProcess (), &th->handle, 0, FALSE,
649 DUPLICATE_SAME_ACCESS))
651 CloseHandle (hThread);
656 th->handle = hThread;
659 ResumeThread (hThread);
661 SetThreadPriority (hThread, priority);
677 /* APC procedure for thread cancellation */
678 static void CALLBACK vlc_cancel_self (ULONG_PTR dummy)
681 vlc_control_cancel (VLC_DO_CANCEL);
686 * Marks a thread as cancelled. Next time the target thread reaches a
687 * cancellation point (while not having disabled cancellation), it will
688 * run its cancellation cleanup handler, the thread variable destructors, and
689 * terminate. vlc_join() must be used afterward regardless of a thread being
692 void vlc_cancel (vlc_thread_t thread_id)
694 #if defined (LIBVLC_USE_PTHREAD_CANCEL)
695 pthread_cancel (thread_id);
696 #elif defined (UNDER_CE)
697 /* HACK:There is no way to use something
698 * like QueueUserAPC on Windows CE, so I rely
699 * on some crappy arch specific code */
701 context.ContextFlags = CONTEXT_CONTROL;
702 GetThreadContext (thread_id->handle, &context);
703 /* Setting the instruction pointer for the canceled thread */
704 #if defined(_ARM_) || defined(ARM)
705 context.Pc = (DWORD_PTR) vlc_cancel_self;
707 SetThreadContext (thread_id->handle, &context);
709 #elif defined (WIN32)
710 QueueUserAPC (vlc_cancel_self, thread_id->handle, 0);
712 # warning vlc_cancel is not implemented!
717 * Waits for a thread to complete (if needed), and destroys it.
718 * This is a cancellation point; in case of cancellation, the join does _not_
721 * @param handle thread handle
722 * @param p_result [OUT] pointer to write the thread return value or NULL
723 * @return 0 on success, a standard error code otherwise.
725 void vlc_join (vlc_thread_t handle, void **result)
727 #if defined( LIBVLC_USE_PTHREAD )
728 int val = pthread_join (handle, result);
730 vlc_thread_fatal ("joining thread", val, __func__, __FILE__, __LINE__);
732 #elif defined( UNDER_CE ) || defined( WIN32 )
735 while (WaitForSingleObjectEx (handle->handle, INFINITE, TRUE)
736 == WAIT_IO_COMPLETION);
738 CloseHandle (handle->handle);
740 *result = handle->data;
747 struct vlc_thread_boot
749 void * (*entry) (vlc_object_t *);
750 vlc_object_t *object;
753 static void *thread_entry (void *data)
755 vlc_object_t *obj = ((struct vlc_thread_boot *)data)->object;
756 void *(*func) (vlc_object_t *) = ((struct vlc_thread_boot *)data)->entry;
759 msg_Dbg (obj, "thread started");
761 msg_Dbg (obj, "thread ended");
766 /*****************************************************************************
767 * vlc_thread_create: create a thread, inner version
768 *****************************************************************************
769 * Note that i_priority is only taken into account on platforms supporting
770 * userland real-time priority threads.
771 *****************************************************************************/
772 int __vlc_thread_create( vlc_object_t *p_this, const char * psz_file, int i_line,
773 const char *psz_name, void * ( *func ) ( vlc_object_t * ),
774 int i_priority, bool b_wait )
777 vlc_object_internals_t *p_priv = vlc_internals( p_this );
779 struct vlc_thread_boot *boot = malloc (sizeof (*boot));
783 boot->object = p_this;
785 /* Make sure we don't re-create a thread if the object has already one */
786 assert( !p_priv->b_thread );
788 #if defined( LIBVLC_USE_PTHREAD )
790 sem_init (&p_priv->thread_ready, 0, 0);
792 if( config_GetInt( p_this, "rt-priority" ) > 0 )
795 /* Hack to avoid error msg */
796 if( config_GetType( p_this, "rt-offset" ) )
797 i_priority += config_GetInt( p_this, "rt-offset" );
799 #elif defined (WIN32)
801 p_priv->thread_ready = CreateEvent (NULL, TRUE, FALSE, NULL);
804 p_priv->b_thread = true;
805 i_ret = vlc_clone( &p_priv->thread_id, thread_entry, boot, i_priority );
808 msg_Dbg( p_this, "thread %lu (%s) created at priority %d (%s:%d)",
809 (unsigned long)p_priv->thread_id, psz_name, i_priority,
813 msg_Dbg( p_this, "waiting for thread initialization" );
814 #if defined (LIBVLC_USE_PTHREAD)
815 sem_wait (&p_priv->thread_ready);
816 sem_destroy (&p_priv->thread_ready);
817 #elif defined (WIN32)
818 WaitForSingleObject (p_priv->thread_ready, INFINITE);
819 CloseHandle (p_priv->thread_ready);
825 p_priv->b_thread = false;
827 msg_Err( p_this, "%s thread could not be created at %s:%d (%m)",
828 psz_name, psz_file, i_line );
834 #undef vlc_thread_ready
835 void vlc_thread_ready (vlc_object_t *obj)
837 vlc_object_internals_t *priv = vlc_internals (obj);
839 assert (priv->b_thread);
840 #if defined (LIBVLC_USE_PTHREAD)
841 assert (pthread_equal (pthread_self (), priv->thread_id));
842 sem_post (&priv->thread_ready);
843 #elif defined (WIN32)
844 SetEvent (priv->thread_ready);
848 /*****************************************************************************
849 * vlc_thread_set_priority: set the priority of the current thread when we
850 * couldn't set it in vlc_thread_create (for instance for the main thread)
851 *****************************************************************************/
852 int __vlc_thread_set_priority( vlc_object_t *p_this, const char * psz_file,
853 int i_line, int i_priority )
855 vlc_object_internals_t *p_priv = vlc_internals( p_this );
857 if( !p_priv->b_thread )
859 msg_Err( p_this, "couldn't set priority of non-existent thread" );
863 #if defined( LIBVLC_USE_PTHREAD )
865 if( config_GetInt( p_this, "rt-priority" ) > 0 )
868 int i_error, i_policy;
869 struct sched_param param;
871 memset( ¶m, 0, sizeof(struct sched_param) );
872 if( config_GetType( p_this, "rt-offset" ) )
873 i_priority += config_GetInt( p_this, "rt-offset" );
874 if( i_priority <= 0 )
876 param.sched_priority = (-1) * i_priority;
877 i_policy = SCHED_OTHER;
881 param.sched_priority = i_priority;
884 if( (i_error = pthread_setschedparam( p_priv->thread_id,
885 i_policy, ¶m )) )
888 msg_Warn( p_this, "couldn't set thread priority (%s:%d): %m",
894 #elif defined( WIN32 ) || defined( UNDER_CE )
895 VLC_UNUSED( psz_file); VLC_UNUSED( i_line );
897 if( !SetThreadPriority(p_priv->thread_id->handle, i_priority) )
899 msg_Warn( p_this, "couldn't set a faster priority" );
908 /*****************************************************************************
909 * vlc_thread_join: wait until a thread exits, inner version
910 *****************************************************************************/
911 void __vlc_thread_join( vlc_object_t *p_this )
913 vlc_object_internals_t *p_priv = vlc_internals( p_this );
915 #if defined( LIBVLC_USE_PTHREAD )
916 vlc_join (p_priv->thread_id, NULL);
918 #elif defined( UNDER_CE ) || defined( WIN32 )
920 FILETIME create_ft, exit_ft, kernel_ft, user_ft;
921 int64_t real_time, kernel_time, user_time;
924 if( ! DuplicateHandle(GetCurrentProcess(),
925 p_priv->thread_id->handle,
930 DUPLICATE_SAME_ACCESS) )
932 p_priv->b_thread = false;
933 return; /* We have a problem! */
936 hThread = p_priv->thread_id->handle;
939 vlc_join( p_priv->thread_id, NULL );
941 if( GetThreadTimes( hThread, &create_ft, &exit_ft, &kernel_ft, &user_ft ) )
944 ((((int64_t)exit_ft.dwHighDateTime)<<32)| exit_ft.dwLowDateTime) -
945 ((((int64_t)create_ft.dwHighDateTime)<<32)| create_ft.dwLowDateTime);
949 ((((int64_t)kernel_ft.dwHighDateTime)<<32)|
950 kernel_ft.dwLowDateTime) / 10;
953 ((((int64_t)user_ft.dwHighDateTime)<<32)|
954 user_ft.dwLowDateTime) / 10;
956 msg_Dbg( p_this, "thread times: "
957 "real %"PRId64"m%fs, kernel %"PRId64"m%fs, user %"PRId64"m%fs",
958 real_time/60/1000000,
959 (double)((real_time%(60*1000000))/1000000.0),
960 kernel_time/60/1000000,
961 (double)((kernel_time%(60*1000000))/1000000.0),
962 user_time/60/1000000,
963 (double)((user_time%(60*1000000))/1000000.0) );
965 CloseHandle( hThread );
968 vlc_join( p_priv->thread_id, NULL );
972 p_priv->b_thread = false;
975 void vlc_thread_cancel (vlc_object_t *obj)
977 vlc_object_internals_t *priv = vlc_internals (obj);
980 vlc_cancel (priv->thread_id);
983 void vlc_control_cancel (int cmd, ...)
985 /* NOTE: This function only modifies thread-specific data, so there is no
986 * need to lock anything. */
987 #ifdef LIBVLC_USE_PTHREAD_CANCEL
993 vlc_cancel_t *nfo = vlc_threadvar_get (&cancel_key);
997 /* Main thread - cannot be cancelled anyway */
1000 nfo = malloc (sizeof (*nfo));
1002 return; /* Uho! Expect problems! */
1003 *nfo = VLC_CANCEL_INIT;
1004 vlc_threadvar_set (&cancel_key, nfo);
1011 case VLC_SAVE_CANCEL:
1013 int *p_state = va_arg (ap, int *);
1014 *p_state = nfo->killable;
1015 nfo->killable = false;
1019 case VLC_RESTORE_CANCEL:
1021 int state = va_arg (ap, int);
1022 nfo->killable = state != 0;
1026 case VLC_TEST_CANCEL:
1027 if (nfo->killable && nfo->killed)
1029 for (vlc_cleanup_t *p = nfo->cleaners; p != NULL; p = p->next)
1034 #if defined (LIBVLC_USE_PTHREAD)
1035 pthread_exit (PTHREAD_CANCELLED);
1036 #elif defined (UNDER_CE)
1038 #elif defined (WIN32)
1041 # error Not implemented!
1050 case VLC_CLEANUP_PUSH:
1052 /* cleaner is a pointer to the caller stack, no need to allocate
1053 * and copy anything. As a nice side effect, this cannot fail. */
1054 vlc_cleanup_t *cleaner = va_arg (ap, vlc_cleanup_t *);
1055 cleaner->next = nfo->cleaners;
1056 nfo->cleaners = cleaner;
1060 case VLC_CLEANUP_POP:
1062 nfo->cleaners = nfo->cleaners->next;